Research Paper
A Software for Establishing Technical Specifications of GEO Communication Satellites

Mehran Mirshams; Ehsan Zabihian

Volume 10, Issue 3 , December 2017, Pages 1-14

Abstract
  This study introduces a new computer code termed AZMIN developed by Space Research Laboratory (SRL). This efficient tool which benefits from the Statistical Design Model (SDM) has been developed for the system design of GEO communication satellites. The main advantage of the AZMIN is to determine technical ...  Read More

Research Paper
Flatness-based Near Optimal Guidance

Reza Esmaelzadeh; Abolghasem Naghash; mahdi mortazavi

Volume 10, Issue 3 , December 2017, Pages 15-24

Abstract
  An optimal explicit guidance law that maximizes terminal velocity is developed for the reentry of a vehicle to a fixed target. The equations of motion are reduced with differential flatness approach and acceleration commands are related to the parameters of trajectory. An optimal trajectory is determined ...  Read More

Research Paper
Improvement of the Electrical Potential Distribution on the Surface Geostationary Satellites using Material Change

arman samadi; Masoud Ebrahimik; Hossein Jahanbakhsh

Volume 10, Issue 3 , December 2017, Pages 25-39

Abstract
  The main objective of this research is to improve the distribution of electrical potential on spacecraft surfaces by changing the surface coatings to reduce the risk of electrostatic discharge in the spacecraft. For this purpose, SPIS software, the EU standard software for modeling and simulating the ...  Read More

Research Paper
Designing Spacecraft Attitude Control Using Model-free Optimal Control Theory

Farid Taji Hervi; ALIREZA NOVINZADEH

Volume 10, Issue 3 , December 2017, Pages 41-57

Abstract
  The purpose of the present paper is to prove the model-free optimal control theory. This theory is derived from the principles of dynamic programming and it is produced for discrete-time systems. The design of the controller depends merely on the I/O data of the controlled planet; hence, the controller ...  Read More

Research Paper
Extraction of a Theoretical Energy-based Model to Estimate Mean Droplet Diameter of the Swirl Injector Spray

Hadiseh Karimaei; seyed mostafa hosseinalipour

Volume 10, Issue 3 , December 2017, Pages 59-65

Abstract
  The droplet formation stage of a spray, which enjoys a great diversity in size and droplet velocity, is predictable through a statistical approach. Since the available methods require experimental data such as mean droplet diameter and mean droplet velocity as inputs to estimate the distribution of the ...  Read More

Research Paper
Investigating the Effective Numerical Solution Parameters in Calculating the Roll Damping Coefficient

Seyyed Ghasem Zamani; vahid bazzar

Volume 10, Issue 3 , December 2017, Pages 67-75

Abstract
  The contribution of injured person in creating or worsening the damage caused by space objects is important in determining the international liability for those. This contribution, which is accepted only in respect of damage caused by space objects located in places other than outer space -land orair- ...  Read More